Minimum-Entropy Blind Acquisition/Equalization for Uplink DS-CDMA
Phil Schniter and C. Richard Johnson, Jr.
Abstract
In this paper, we consider blind estimation of linear chip-spaced
receivers for the demodulation of a particular short-code DS-CDMA mobile
user under multipath propagation and in the absence of timing information.
We propose a family of schemes for blind acquisition and equalization
based on Donoho's Minimum Entropy principle and propose a
specific algorithm that uses the second- and fourth-order moments
of a pre-whitened chip-rate received signal. The proposed algorithm
can be considered a near-far resistant initialization procedure for, and
application of, the Constant Modulus Algorithm (CMA) to DS-CDMA.
